<template>
    <div>
     <!-- 面包屑导航区 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图区域 -->
      <el-card>
      <!-- 顶部提示信息 -->
        <el-alert
         title="添加商品信息"
         type="info"
         :closable="false"
         show-icon
         center>
        </el-alert>
        <!-- 步骤条 -->
        <el-steps align-center :space="200" :active="activeStep - 0" finish-status="success">
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
        <!-- Tabs栏 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
          <el-tabs tab-position="left" v-model="activeStep"
          :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="商品信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cascaderProps"
                  @change="parentCateChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!-- 渲染表单item项 -->
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <el-checkbox-group v-model="item.attr_vals" >
                  <el-checkbox :label="item2" v-for="(item2, i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item v-for=" item in onlyTableData" :key="item.attr_id"  :label="item.attr_name">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!--action:图片要上传的后台api接口  -->
              <el-upload
              action="http://127.0.0.1:8888/api/private/v1/upload"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器组件 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加商品按钮 -->
              <el-button class="addBtn" type="primary" @click="addGoods">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
        <!-- 图片预览窗口 -->
        <el-dialog
        title="图片预览"
        :visible.sync="predialogVisible"
        width="30%">
        <div><img :src="prePath" class="previewImg"></div>
      </el-dialog>
      </el-card>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
  data () {
    return {
      activeStep: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: '0',
        goods_number: '0',
        goods_weight: '0',
        // 商品所属的分类数组
        goods_cat: [],
        // 图片数组
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      // 表单校验规则
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      cateList: [],
      // 级联选择器属性
      cascaderProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片组件的请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      prePath: '',
      predialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList () {
      const res = await this.$http.get('categories')
      if (res.data.meta.status !== 200) {
        this.$message.error('获取分类数据失败')
      } else {
        this.cateList = res.data.data
      }
    },
    // 级联选择器选择变化触发函数
    parentCateChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // tab 被选中时触发
    async tabClicked () {
      // 访问的动态参数面板
      if (this.activeStep === '1') {
        const res = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.data.meta.status !== 200) {
          this.$message.error('获取参数信息失败')
        } else {
          res.data.data.forEach(item => {
            item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          })
          this.manyTableData = res.data.data
        }
      } else if (this.activeStep === '2') {
        const res = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.data.meta.status !== 200) {
          this.$message.error('获取静态属性失败')
        } else {
          this.onlyTableData = res.data.data
        }
      }
    },
    // 监听图片上传成功事件
    handleSuccess (response) {
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片对象push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 图片预览
    handlePreview (file) {
      this.prePath = file.response.data.url
      this.predialogVisible = true
    },
    // 图片移除
    handleRemove (file) {
      // 获取将要删除图片的tmp_path
      const filePath = file.response.data.tmp_path
      // 在pics找到将要删除图片的索引
      const i = this.addForm.pics.findIndex(item =>
        item.pic === filePath)
      this.addForm.pics.splice(i, 1)
      // 根据索引移除数组中对应的数据
    },
    // 添加商品
    addGoods () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          this.$message.error('请填写必要的表单项')
        } else {
          // lodash   cloneDeep(obj) 将对象深拷贝
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          // 发请求添加商品
          // 商品名称必须是唯一的
          const res = await this.$http.post('goods', form)
          if (res.data.meta.status !== 201) {
            this.$message.error('添加商品失败')
          } else {
            this.$message.success('添加商品成功')
            this.$router.push('/goods')
          }
        }
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }

}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0  !important;
}
.previewImg {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>
